Minimal chemicals? Menthol is the way to go, it's just one chemical compound.
http://wildfoodism.files.wordpress.com/2014/01/blueberrieswildfoodism.jpg check out all the chemicals in a blueberry. Then imagine the chemical processing that has to be done to the blueberry to isolate the flavoring chemicals to produce a natural flavoring.
Pick any berry and they will have a number of flavoring chemicals in common.
So if you are really looking for minimal chemicals, then things like menthol are the way to go. If you are looking for chemicals that are chemically extracted from natural organic matter, Natures Flavor is a pretty good choice.
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